[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 29.243673] kauditd_printk_skb: 8 callbacks suppressed [ 29.243687] audit: type=1800 audit(1545631733.010:29): pid=6008 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2432 res=0 [ 29.276218] audit: type=1800 audit(1545631733.010:30): pid=6008 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2423 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.10.15' (ECDSA) to the list of known hosts. 2018/12/24 06:09:03 fuzzer started 2018/12/24 06:09:04 connecting to host at 10.128.0.26:42727 2018/12/24 06:09:04 checking revisions... 2018/12/24 06:09:04 testing simple program... syzkaller login: [ 41.227903] IPVS: ftp: loaded support on port[0] = 21 executing program executing program executing program executing program executing program executing program [ 60.163892] WARNING: CPU: 0 PID: 7 at include/linux/blk-cgroup.h:518 __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.174116] Kernel panic - not syncing: panic_on_warn set ... [ 60.180028] CPU: 0 PID: 7 Comm: kworker/u4:0 Not tainted 4.20.0-rc7-next-20181221 #186 [ 60.188080] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.197454] Workqueue: writeback wb_workfn (flush-8:0) [ 60.202769] Call Trace: [ 60.205367] dump_stack+0x1d3/0x2c6 [ 60.209006] ? dump_stack_print_info.cold.1+0x20/0x20 [ 60.214214] panic+0x2ad/0x632 [ 60.217414] ? add_taint.cold.5+0x16/0x16 [ 60.221592] ? __warn.cold.8+0x5/0x4f [ 60.225435] ? __warn+0xe8/0x1d0 [ 60.228808] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.234177] __warn.cold.8+0x20/0x4f [ 60.237893] ? rcu_softirq_qs+0x20/0x20 [ 60.241878] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.247245] report_bug+0x254/0x2d0 [ 60.250884] do_error_trap+0x11b/0x200 [ 60.254806] do_invalid_op+0x36/0x40 [ 60.258518] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.263887] invalid_op+0x14/0x20 [ 60.267345] RIP: 0010:__bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.273360] Code: 7b 50 48 89 f8 48 c1 e8 03 42 80 3c 20 00 0f 85 f1 00 00 00 48 8b 43 50 4c 89 ef e8 bf c6 88 04 e9 a4 f9 ff ff e8 c5 ad 07 fe <0f> 0b e9 5c fa ff ff e8 b9 ad 07 fe e8 ab e2 88 fd e9 fe f9 ff ff [ 60.292268] RSP: 0018:ffff8881d9ac5738 EFLAGS: 00010293 [ 60.297629] RAX: ffff8881d9aba1c0 RBX: 0000000000000000 RCX: ffffffff83779576 [ 60.304895] RDX: 0000000000000000 RSI: ffffffff83779b1b RDI: 0000000000000005 [ 60.312168] RBP: ffff8881d9ac58b8 R08: ffff8881d9aba1c0 R09: ffffed103b5c5b77 [ 60.319437] R10: ffffed103b5c5b77 R11: ffff8881dae2dbbb R12: ffff8881cee6cac0 [ 60.326726] R13: ffff8881b0160a00 R14: ffff8881bcc4d218 R15: ffff8881cee6cac0 [ 60.334036] ? __bio_associate_blkg.isra.36+0x266/0x8f0 [ 60.339401] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.344777] ? __bio_associate_blkg.isra.36+0x80b/0x8f0 [ 60.350156] ? kasan_check_write+0x14/0x20 [ 60.354390] ? bio_init+0x139/0x260 [ 60.358022] ? bio_reset+0x510/0x510 [ 60.361746] ? mark_held_locks+0x130/0x130 [ 60.366002] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.371546] ? bio_alloc_bioset+0x2cc/0x6f0 [ 60.375879] ? mark_held_locks+0x130/0x130 [ 60.380121] ? bvec_alloc+0x2d0/0x2d0 [ 60.383927] __bio_clone_fast+0x412/0x5e0 [ 60.388080] bio_clone_fast+0x42/0x110 [ 60.391978] bio_split+0x86/0x260 [ 60.395439] blk_queue_split+0xa1e/0x2080 [ 60.399589] ? blk_queue_bounce+0x126/0x29b6 [ 60.404025] ? __blk_recalc_rq_segments+0xe20/0xe20 [ 60.409064] ? find_held_lock+0x36/0x1c0 [ 60.413146] ? graph_lock+0x270/0x270 [ 60.416961] ? ktime_get+0x332/0x400 [ 60.420696] ? find_held_lock+0x36/0x1c0 [ 60.424990] blk_mq_make_request+0x2e7/0x1e30 [ 60.429493] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.435055] ? check_preemption_disabled+0x48/0x280 [ 60.440094] ? blk_mq_try_issue_directly+0xaf0/0xaf0 [ 60.445199] ? __lock_is_held+0xb5/0x140 [ 60.449280] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 60.454834] ? trace_event_raw_event_block_rq_requeue+0x6f0/0x6f0 [ 60.461076] ? __set_page_dirty_buffers+0x810/0x810 [ 60.466121] ? ___might_sleep+0x1ed/0x300 [ 60.470274] ? ext4_mark_iloc_dirty+0x17a9/0x2f30 [ 60.475122] ? arch_local_save_flags+0x40/0x40 [ 60.479702] ? lock_downgrade+0x900/0x900 [ 60.483904] ? kasan_check_write+0x14/0x20 [ 60.488142] ? __brelse+0x104/0x180 [ 60.491803] ? block_commit_write+0x30/0x30 [ 60.496130] ? __ext4_handle_dirty_metadata+0x1e0/0x5a0 [ 60.501505] ? kasan_check_write+0x14/0x20 [ 60.505783] ? ext4_mark_iloc_dirty+0x199a/0x2f30 [ 60.510654] generic_make_request+0x9a5/0x1890 [ 60.515242] ? ___might_sleep+0x1ed/0x300 [ 60.519398] ? blk_queue_enter+0x11f0/0x11f0 [ 60.523812] ? other_inode_match+0xbb0/0xbb0 [ 60.528232] ? __might_sleep+0x95/0x190 [ 60.532217] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.537757] ? __ext4_journal_get_write_access+0x6d/0xa0 [ 60.543231] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.548773] ? ext4_reserve_inode_write+0x148/0x260 [ 60.553798] ? ext4_mark_inode_dirty+0x266/0xb20 [ 60.558701] ? ext4_expand_extra_isize+0x5b0/0x5b0 [ 60.563647] ? lock_release+0xa00/0xa00 [ 60.567629] submit_bio+0xba/0x460 [ 60.571185] ? submit_bio+0xba/0x460 [ 60.574907] ? generic_make_request+0x1890/0x1890 [ 60.579763] ? up_write+0x7b/0x220 [ 60.583307] ? down_write_nested+0x130/0x130 [ 60.587724] ? down_read+0x120/0x120 [ 60.591445] ext4_io_submit+0x197/0x230 [ 60.595425] ext4_writepages+0x1c4b/0x4190 [ 60.599731] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.604489] ? graph_lock+0x240/0x270 [ 60.608310] ? print_usage_bug+0xc0/0xc0 [ 60.612396] ? __lock_acquire+0x62f/0x4c20 [ 60.616664] ? hctx_unlock+0xde/0x150 [ 60.620494] ? print_usage_bug+0xc0/0xc0 [ 60.624562] ? __lock_acquire+0x62f/0x4c20 [ 60.628801] ? mark_held_locks+0x130/0x130 [ 60.633036] ? __ext4_get_inode_loc+0x470/0x1330 [ 60.637806] ? mark_held_locks+0x130/0x130 [ 60.642089] ? graph_lock+0x270/0x270 [ 60.645896] ? kasan_check_write+0x14/0x20 [ 60.650136] ? __brelse+0x104/0x180 [ 60.653776] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.659321] ? check_preemption_disabled+0x48/0x280 [ 60.664357] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.669155] do_writepages+0x9a/0x1a0 [ 60.672979] ? ext4_mark_inode_dirty+0xb20/0xb20 [ 60.677767] ? do_writepages+0x9a/0x1a0 [ 60.681795] __writeback_single_inode+0x20a/0x1660 [ 60.686749] ? __mark_inode_dirty+0x1510/0x1510 [ 60.691432] ? find_held_lock+0x36/0x1c0 [ 60.695525] ? find_held_lock+0x36/0x1c0 [ 60.699601] ? wbc_attach_and_unlock_inode+0x5c0/0xa30 [ 60.704879] ? lock_downgrade+0x900/0x900 [ 60.709047] ? find_held_lock+0x13f/0x1c0 [ 60.713233] ? kasan_check_read+0x11/0x20 [ 60.717424] ? do_raw_spin_unlock+0xa7/0x330 [ 60.721850] ? do_raw_spin_trylock+0x270/0x270 [ 60.726448] ? __lock_is_held+0xb5/0x140 [ 60.730525] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.736066] ? wbc_attach_and_unlock_inode+0x675/0xa30 [ 60.741355] ? __writeback_single_inode+0x1660/0x1660 [ 60.746559] writeback_sb_inodes+0x71f/0x1210 [ 60.751075] ? wbc_detach_inode+0x960/0x960 [ 60.755404] ? lock_release+0xa00/0xa00 [ 60.759404] ? down_read_trylock+0xda/0x140 [ 60.763739] ? trylock_super+0x22/0x110 [ 60.767730] ? downgrade_write+0x270/0x270 [ 60.771978] ? queue_io+0x3dd/0x800 [ 60.775619] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 60.781176] __writeback_inodes_wb+0x1b9/0x340 [ 60.785774] ? writeback_sb_inodes+0x1210/0x1210 [ 60.790533] ? __lock_is_held+0xb5/0x140 [ 60.794616] wb_writeback+0xa73/0xfc0 [ 60.798441] ? writeback_inodes_wb.constprop.50+0x330/0x330 [ 60.804178] ? widen_string+0xe0/0x2e0 [ 60.808074] ? __sanitizer_cov_trace_switch+0x53/0x90 [ 60.813296] ? print_usage_bug+0xc0/0xc0 [ 60.817363] ? string+0x225/0x2d0 [ 60.820823] ? widen_string+0x2e0/0x2e0 [ 60.824808] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.829833] ? find_next_bit+0x104/0x130 [ 60.833906] ? __sanitizer_cov_trace_cmp8+0x18/0x20 [ 60.838925] ? find_next_bit+0x104/0x130 [ 60.842997] ? cpumask_next+0x41/0x50 [ 60.846814] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 60.851833] ? get_nr_dirty_inodes+0xd6/0x130 [ 60.856351] ? __local_bh_enable_ip+0x160/0x260 [ 60.861044] ? get_nr_dirty_pages+0x17c/0x1f0 [ 60.865541] ? _raw_spin_unlock_bh+0x30/0x40 [ 60.869957] ? inode_sleep_on_writeback+0x240/0x240 [ 60.875011] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.880554] ? check_preemption_disabled+0x48/0x280 [ 60.885573] ? wb_workfn+0x521/0x1790 [ 60.889375] ? wb_workfn+0x521/0x1790 [ 60.893181] ? __local_bh_enable_ip+0x160/0x260 [ 60.897855] wb_workfn+0x1008/0x1790 [ 60.901601] ? __lock_acquire+0x62f/0x4c20 [ 60.905871] ? inode_wait_for_writeback+0x40/0x40 [ 60.910734] ? mark_held_locks+0x130/0x130 [ 60.914982] ? graph_lock+0x270/0x270 [ 60.918788] ? graph_lock+0x270/0x270 [ 60.922584] ? lock_is_held_type+0x210/0x210 [ 60.926982] ? graph_lock+0x270/0x270 [ 60.930802] ? debug_object_deactivate+0x37d/0x480 [ 60.935722] ? lock_downgrade+0x900/0x900 [ 60.939854] ? find_held_lock+0x36/0x1c0 [ 60.943898] ? graph_lock+0x270/0x270 [ 60.947687] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 60.953238] ? check_preemption_disabled+0x48/0x280 [ 60.958272] ? __lock_is_held+0xb5/0x140 [ 60.962335] process_one_work+0xc90/0x1c40 [ 60.966578] ? mark_held_locks+0x130/0x130 [ 60.970811] ? pwq_dec_nr_in_flight+0x4a0/0x4a0 [ 60.975461] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 60.981598] ? __switch_to_asm+0x34/0x70 [ 60.985660] ? __switch_to_asm+0x34/0x70 [ 60.989994] ? __switch_to_asm+0x40/0x70 [ 60.990028] ? __switch_to_asm+0x34/0x70 [ 60.998128] ? __switch_to_asm+0x40/0x70 [ 61.002172] ? __switch_to_asm+0x34/0x70 [ 61.006211] ? __switch_to_asm+0x34/0x70 [ 61.010250] ? __switch_to_asm+0x34/0x70 [ 61.014308] ? __switch_to_asm+0x40/0x70 [ 61.018374] ? __switch_to_asm+0x34/0x70 [ 61.022412] ? __switch_to_asm+0x40/0x70 [ 61.026461] ? __switch_to_asm+0x34/0x70 [ 61.030511] ? __sched_text_start+0x8/0x8 [ 61.034638] ? graph_lock+0x270/0x270 [ 61.038420] ? lock_downgrade+0x900/0x900 [ 61.042549] ? lockdep_hardirqs_on+0x421/0x5c0 [ 61.047110] ? find_held_lock+0x36/0x1c0 [ 61.051153] ? lock_acquire+0x1ed/0x520 [ 61.055108] ? worker_thread+0x3e0/0x1390 [ 61.059240] ? kasan_check_write+0x14/0x20 [ 61.063456] ? do_raw_spin_lock+0x14f/0x350 [ 61.067763] ? __schedule+0x1ed0/0x1ed0 [ 61.071727] ? rwlock_bug.part.2+0x90/0x90 [ 61.075946] ? trace_hardirqs_on+0x310/0x310 [ 61.080339] worker_thread+0x17f/0x1390 [ 61.084312] ? __bpf_trace_sched_wake_idle_without_ipi+0x10/0x10 [ 61.090440] ? process_one_work+0x1c40/0x1c40 [ 61.094918] ? __schedule+0x9e6/0x1ed0 [ 61.098803] ? __sched_text_start+0x8/0x8 [ 61.102934] ? __sched_text_start+0x8/0x8 [ 61.107071] ? __kthread_parkme+0xce/0x1a0 [ 61.111291] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 61.116377] ? _raw_spin_unlock_irqrestore+0x82/0xd0 [ 61.121462] ? lockdep_hardirqs_on+0x421/0x5c0 [ 61.126024] ? trace_hardirqs_on+0xbd/0x310 [ 61.130326] ? kasan_check_read+0x11/0x20 [ 61.134456] ? __kthread_parkme+0xce/0x1a0 [ 61.138676] ? __bpf_trace_preemptirq_template+0x30/0x30 [ 61.144130] ? __schedule+0x1ed0/0x1ed0 [ 61.148089] ? _raw_spin_unlock_irqrestore+0x6d/0xd0 [ 61.153207] ? __sanitizer_cov_trace_const_cmp8+0x18/0x20 [ 61.158735] ? __kthread_parkme+0xfb/0x1a0 [ 61.162955] ? process_one_work+0x1c40/0x1c40 [ 61.167430] kthread+0x35a/0x440 [ 61.170779] ? kthread_bind+0x40/0x40 [ 61.174562] ret_from_fork+0x3a/0x50 [ 61.179205] Kernel Offset: disabled [ 61.182866] Rebooting in 86400 seconds..